import java.util.ArrayList;
import java.util.Collection;

/**
 * @program: 2022.2.28
 * @description:
 * @author: 李鑫月
 * @create: 2022-02-28 14:31
 **/
public class TestDemo {
    public static void main(String[] args) {
        Collection<String> collection=new ArrayList<String>();
        collection.add("aa");
        Collection<Integer> collection1=new ArrayList<Integer>();
        collection1.add(1);
        System.out.println(collection);
        
    }
}
